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오수환,이철욱,김기수,고현성,박상기,박문호,이지면,Oh Su Hwan,Lee Chul-Wook,Kim Ki Soo,Ko Hyunsung,Park Sahnggi,Park Moon-Ho,Lee Ji-Myon 한국광학회 2004 한국광학회지 Vol.15 No.5
본 논문에서는 저 전류 및 고 효율로 동작하는 planar buried heterostructure(PBH) 구조로 sampled grating(SG) distributed bragg reflector(DBR) laser diode(LD)를 처음으로 설계하고 제작하였다. 특히 활성층과 도파로층의 높은 결합 효율을 얻기 위해 건식 식각과 습식 식각을 같이 사용하여 결함이 거의 없는 butt-coupling(BT) 계면을 형성하였다. 제작된 파장 가변레이저의 평균 발진 임계전류는 약 12 mA로 ridged waveguide(RWG)와 buried ridge stripe(BRS) 구조로 제작된 결과 보다 두 배 정도 낮게 나타났으며, 광 출력은 200 mA에서 약 20 mW 정도로 RWG 와 BRS 보다 각각 9 mW, 13 mW 더 우수하게 나타났다. 그리고 파장 가변 영역을 측정한 결과 44 nm로 설계결과와 일치하였으며, 최대 파장 가변 영역 안에서 출력 변화 폭이 5 dB 이내로서 RWG 구조의 9 dB보다 출력변화 폭이 4 dB 적게 나타났다. 전체 파장 가변 영역에서 SMSR이 35 dB 이상으로 나타났다. We have fabricated and designed wavelength-tunable sampled grating distributed Bragg reflector laser diodes(SGDBR-LD) by using, for the first time, planar buried heterostructures(PBH). The diodes have low threshold current values and high-performance of laser operation. Growth condition using metal organic chemical vapor deposition(MOCVD) was optimized for the formation of a good butt-coupling at the interface. A maximum output power of the fabricated device was 20 mW under 200 mA continuous wave(CW) operation at $25^{\circ}C$. Average threshold current and voltage were 12 mA and 0.8 V, approximately. This output power is higher than those of ridge waveguide(RWG) and buried ridge stripe(BRS) structures by amounts of 9 mW and 13 mW, respectively. We obtained a tuning range of 44.4nm which is well matched with the target value of our design. The side mode suppression ratio of more than 35 dB was obtained for the whole tuning range. Optical output power variation was less than 5 dB, which is 4 dB smaller than that of RWG structures.
멜론(Cucumis melo L.) 수확 후 관리기술 최근 연구 동향
오수환 ( Su Hwan Oh ),배로나 ( Ro Na Bae ),이승구 ( Seung Koo Lee ) 한국식품저장유통학회(구 한국농산물저장유통학회) 2011 한국식품저장유통학회지 Vol.18 No.4
Among Cucubitaceae, melon (Cucumis melo) is one of the most diversified fruits, with various forms, sizes, pulps, and peel colors. In addition, it is a commercially important crop because of its high sweetness, deep flavor, and abundant juice. In the species, there are both climacteric and non-climacteric melons depending on the respiration and ethylene production patterns after harvest. Ethylene is also considered a crucial hormone for determining sex expression. Phytohormones other than ethylene interact and regulate ripening. There are some indices that can be used to evaluate the optimum harvest maturity. The harvest time can be estimated after the pollination time, which is the most commonly used method of determining the harvest maturity of the fruit. Besides the physiological aspects, the biochemical alterations, including those of sweetness, firmness, flavor, color, and rind, contribute to the overall fruit quality. These changes can be categorized based on the ethylene-dependent and ethylene-independent phenomena due to the ethylene-suppressed transgenic melon. After harvest, the fruits are precooled to 10℃ to reduce the field heat, after which they are sized and packed. The fruits can be treated with hot water (60℃ for 60 min) to prevent the softening of the enzyme activity and microorganisms, and with calcium to maintain their firmness. 1-methylenecyclopropene (1-MCP) treatment also maintains their storability by inhibiting respiration and ethylene production. The shelf life of melon is very short even under cold storage, like other cucurbits, and it is prone to obtaining chilling injury under 10℃. In South Korea, low-temperature (10℃) storage is known to be the best storage condition for the fruit. For long-time transport, CA storage is a good method of maintaining the quality of the fruit by reducing the respiration and ethylene. For fresh-cut processing, washing with a sanitizing agent and packing with plastic-film processing are needed, and low-temperature storage is necessary. The consumer need and demand for fresh-cut melon are growing, but preserving the quality of fresh-cut melon is more challenging than preserving the quality of the whole fruit.
입상 암면 용량과 코이어 및 암면 배지 종류에 따른 수경재배 멜론의 생육 특성
정대호(Dae Ho Jung),오수환(Su Hwan Oh),김다미(Da Mi Kim),이수오(Su Oh Lee),조철희(Chul Hee Cho),조혜원(Hye Won Cho),하철규(Chul Kyoo Ha),이현아(Hyun-Ah Lee) (사)한국생물환경조절학회 2023 생물환경조절학회지 Vol.32 No.1
멜론은 풍부한 비타민과 섬유질을 제공하는 작물로 대부분 토양에서 재배하고 있다. 그러나 수경재배를 통해 생산량과 품질을 높이기 위한 시도가 늘어나고 있는 추세에 있으며, 생육을 최대화할 수 있는 배지에 대한 요구도가 높은 작물이다. 본 연구에서는 입상 암면 배지를 이용하여 근권부 용량을 다르게 수경재배한 경우와 코이어 및 암면 슬라브 배지를 활용하여 수경재배한 경우 멜론의 수체와 과실의 생육에 어떠한 영향이 있는지 파악하고자 하였다. ‘금세계’ 품종(Cucumis melo L. cv. Geumsegye)을 입상 암면 용량을 1.0, 1.5, 2.0, 3.0, 4.0L로 달리하여 수경재배하였으며, 코이어 슬라브와 암면 슬라브를 사용해 재배하였다. 작물의 초장, 엽장, 엽폭 등 생육 특성을 조사하여 로지스틱 모델을 적용하였으며, 과실의 특성을 분석하였다. 멜론의 생육 특성은 1.0L 용량의 입상 암면에서 재배한 것에 비해 4.0L 용량에서 유의하게 증가하였고, 코이어 슬라브와 암면 슬라브에서 가장 높은 결과를 나타내었다. 암면 슬라브에서 재배한 멜론에서 가장 과실 생체중과 과장, 과폭이 크게 나타났다. 수경재배 시 입상 암면 용량은 4.0L 수준에서 가장 생육이 좋으며, 코이어 슬라브와 암면 슬라브 등을 이용하는 것이 가장 좋은 생육을 보였다. 앞으로 무네트 멜론의 근권부 환경에 따른 생육을 확인하는 연구가 추가적으로 수행될 필요가 있다. Melons, a rich source of vitamins and fibers, are commonly grown in the soil. Hydroponic cultivation could improve yield and quality of melon and selection of substrate volume and the kind of substrates is important for hydroponic cultivation of melons. This study investigated the effect on melon growth according to volume of granular rockwool and substrates of coir and rockwool slab. ‘Geumsegye’ melon (Cucumis melo L. cv. Geumsegye) was cultivated hydroponically according to volume of granular rockwool to 1.0, 1.5, 2.0, 3.0, and 4.0 L, and was also cultivated using coir and rockwool slabs. Logistic model was applied to estimate the growth characteristics of melons such as plant height, leaf length, leaf width, and the characteristics of fruit. The growth characteristics of melons were significantly increased at 4.0 L compared to those grown of 1.0 L volume of on granular rockwool, and the results were the highest in coir and rockwool slabs. Melons grown in rockwool slabs showed the largest fruit fresh weight, fruit length, and fruit width. During hydroponic cultivation, growth characteristics of melon appropriate at the 4.0 L volume of granular rockwool, and the highest at coir and rockwool slabs. This study provides a basis for understanding the effect of root zone environment to the growth characteristics and fruit quality of non-netted melon.
임병선(Byung-Seon Lim),홍세진(Sae Jin Hong),오수환(Su Hwan Oh),정대성(Dae-Sung Chung),김기홍(Kee Hong Kim) 한국원예학회 2010 원예과학기술지 Vol.28 No.2
무넷트멜론 ‘홈런스타’와 넷트멜론 ‘얼스’를 0, 2, 5, 10, 20℃의 저장온도에서 각각 4주 및 2주 저장하여 과피갈변장해 및 부패 등을 조사하였다. 무넷트 멜론 ‘홈런스타’과실은 0℃ 및 2℃에서 저장 2주 만에 과피갈변이 각각 75.9% 및 37.6% 발생하였으며, 저장 3주 후 5℃ 및 10℃에서도 과피갈변이 각각100% 및 38.7%가 발생하였다. 즉, 온도가 낮을수록 과피 갈변 현상은 더욱 심해지는 경향을 보였다. 넷트멜론 ‘얼스’의 수확후 부패에 영향하는 균은 Ascochyta sp.과 Fusarium semitectum이 영향하며, 여름철에 수확(7월 14일)된 멜론은 20℃에서 1주 만에 100% 부패하였고, 10℃에서도 33%의 부패율을 보였다. 가을에 수확(10월 7일)된 과실은 20℃ 및 10℃ 에서 1주 후에 부패과를 전혀 볼 수 없었으며, 2주 후에도 20℃처리구에서 12%만이 미약한 부패증상을 보였고, 10℃에서는 전혀 부패하지 않았다. 0, 2, 5, 10℃에서 2주 저장 후 상온 20℃에서 1주일 모의 유통 후 식미도는 0℃와 2℃에서 저장된 멜론보다는 5℃, 10℃에서 저장한 멜론의 식미도가 높았다. The effects of storage temperature on the incidence of skin browning disorder and decay, and quality changes in muskmelon (Cucumis melo L. cv. Reticulatus) were investigated in different cultivars and harvest seasons. Melons were harvested at commercial maturity, stored at 0, 2, 5, 10 and 20℃ for two weeks in netted muskmelon ‘Earl’s’ or 4 weeks in non-netted muskmelon ‘Homerun Star’. The incidence of skin browning was 100% after 2 weeks of storage at 0 and 2℃, and also after 3 weeks storage at 5 and 10℃ in ‘Homerun Star’ fruit. This symptom appeared more quickly and severely in the fruits stored at lower temperatures. The decay in ‘Earl’s’ fruit was induced by Ascochyta sp. and Fusarium semitectum. The fruits harvested in summer season decayed up to 100% and 33% after 1 week storage at 20℃ and 10℃, respectively. No decay was observed on fruit harvested in autumn season at the same storage temperature. Only 12% of fruit decayed even after 2 weeks of storage at 20℃ and no decayed fruit was found at 10℃. When the stored fruits were transferred to 20℃ after 2 weeks at 0, 2, 5, 10 and 20℃, the sensory quality was lower in fruit stored at lower temperatures such as 0 and 2℃ than 5 to 10℃.